Effects of Fe plaque and organic acids on metal uptake by wetland plants under drained and waterlogged conditions

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Abstract

This study aims to assess the role of Fe plaque in metal uptake and translocation by different wetland plants and examine the effects of organic acids on metal detoxification in wetland plants. It was found that although exposed to a similar level of metals in rhizosphere soil solution, metal uptake by shoots of Cypercus flabelliformis and Panicum paludosum was greatly reduced, consequently leading to a better growth under flooded than under drained conditions. This may be related to the enhanced Fe plaque in the former, but due to the decreased root permeability in the latter under anoxic conditions. The Fe plaque on root surface has potential to sequester metals and then reduce metal concentrations and translocation in shoot tissues. However, whether the Fe plaque acts as a barrier to metal uptake and translocation may also be dependent on the root anatomy. Although metal tolerance in wetland plants mainly depends upon their metal exclusion ability, the higher-than-toxic-level of metal concentrations in some species indicates that internal metal detoxification might also exist. It was suggested that malic or citric acid in shoots of P. paludosum and C. flabelliformis may account for their internal detoxification for Zn. Copyright © 2017 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)732-741
JournalEnvironmental Pollution
Volume231
Issue numberPart 1
Early online dateAug 2017
DOIs
Publication statusPublished - Dec 2017

Fingerprint

Wetlands
Organic acids
Metals
Acids
Detoxification
Panicum
Rhizosphere
Poisons
Citric acid
Surface potential
Citric Acid
Permeability
Anatomy
Soil
Tissue
Soils

Citation

Li, W. C., Deng, H., & Wong, M. H. (2017). Effects of Fe plaque and organic acids on metal uptake by wetland plants under drained and waterlogged conditions. Environmental Pollution, 231(Part 1), 732-741.

Keywords

  • Metal tolerance
  • Metal accumulation
  • Rhizosphere
  • Fe plaque
  • Organic acids